From 448d27cd795dc273249f123444509403f4fa4fac Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Tue, 7 Nov 2006 21:49:50 +0000
Subject: [PATCH] Add FunctionPassManager_New.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31515 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/PassManager.h | 35 ++++++++++++++++++++++++
 lib/VMCore/PassManager.cpp | 56 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 91 insertions(+)

diff --git a/include/llvm/PassManager.h b/include/llvm/PassManager.h
index 2769a4dbf2a..53dfa6bab0f 100644
--- a/include/llvm/PassManager.h
+++ b/include/llvm/PassManager.h
@@ -108,6 +108,41 @@ private:
   std::vector<Pass *> PassVector;
 };
 
+/// FunctionPassManager_New manages FunctionPasses and BasicBlockPassManagers.
+/// It batches all function passes and basic block pass managers together and
+/// sequence them to process one function at a time before processing next
+/// function.
+class FunctionPassManager_New:public Pass {
+public:
+  FunctionPassManager_New(ModuleProvider *P) { /* TODO */ }
+  FunctionPassManager_New() { 
+    activeBBPassManager = NULL;
+  }
+  ~FunctionPassManager_New() { /* TODO */ };
+ 
+  /// add - Add a pass to the queue of passes to run.  This passes
+  /// ownership of the Pass to the PassManager.  When the
+  /// PassManager_X is destroyed, the pass will be destroyed as well, so
+  /// there is no need to delete the pass. (TODO delete passes.)
+  /// This implies that all passes MUST be allocated with 'new'.
+  void add(Pass *P) { /* TODO*/  }
+
+  /// Add pass into the pass manager queue.
+  bool addPass(Pass *P);
+
+  /// Execute all of the passes scheduled for execution.  Keep
+  /// track of whether any of the passes modifies the function, and if
+  /// so, return true.
+  bool runOnModule(Module &M);
+
+private:
+  // Collection of pass that are not yet scheduled
+  std::vector<Pass *> PassVector;
+ 
+  // Active Pass Managers
+  BasicBlockPassManager_New *activeBBPassManager;
+};
+
 } // End llvm namespace
 
 #endif
diff --git a/lib/VMCore/PassManager.cpp b/lib/VMCore/PassManager.cpp
index bd8faac60a2..450a515c40b 100644
--- a/lib/VMCore/PassManager.cpp
+++ b/lib/VMCore/PassManager.cpp
@@ -54,3 +54,59 @@ BasicBlockPassManager_New::runOnFunction(Function &F) {
   return Changed;
 }
 
+// FunctionPassManager_New implementation
+
+///////////////////////////////////////////////////////////////////////////////
+// FunctionPassManager
+
+/// Add pass P into the pass manager queue. If P is a BasicBlockPass then
+/// either use it into active basic block pass manager or create new basic
+/// block pass manager to handle pass P.
+bool
+FunctionPassManager_New::addPass (Pass *P) {
+
+  // If P is a BasicBlockPass then use BasicBlockPassManager_New.
+  if (BasicBlockPass *BP = dynamic_cast<BasicBlockPass*>(P)) {
+
+    if (!activeBBPassManager
+        || !activeBBPassManager->addPass(BP)) {
+
+      activeBBPassManager = new BasicBlockPassManager_New();
+
+      PassVector.push_back(activeBBPassManager);
+      assert (!activeBBPassManager->addPass(BP) &&
+              "Unable to add Pass");
+    }
+    return true;
+  }
+
+  FunctionPass *FP = dynamic_cast<FunctionPass *>(P);
+  if (!FP)
+    return false;
+
+  // TODO: Check if it suitable to manage P using this FunctionPassManager
+  // or we need another instance of BasicBlockPassManager
+
+  PassVector.push_back(FP);
+  activeBBPassManager = NULL;
+  return true;
+}
+
+/// Execute all of the passes scheduled for execution by invoking 
+/// runOnFunction method.  Keep track of whether any of the passes modifies 
+/// the function, and if so, return true.
+bool
+FunctionPassManager_New::runOnModule(Module &M) {
+
+  bool Changed = false;
+  for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
+    for (std::vector<Pass *>::iterator itr = PassVector.begin(),
+           e = PassVector.end(); itr != e; ++itr) {
+      Pass *P = *itr;
+      FunctionPass *FP = dynamic_cast<FunctionPass*>(P);
+      Changed |= FP->runOnFunction(*I);
+    }
+  return Changed;
+}
+
+